An oxygen atom shares two electrons with another oxygen atom to make a DOUBLE BOND; two shared electrons

the nuclei of both atoms involved in a covalent bond are positively charged and the electrons involved are attracted to the nuclei, and so remain a fixed distance apart from each nucleus. this distance is called the bond length.

Covalent bonds have low boiling and melting points because they have weak attractions between the molecules these are called intermolecular forces

Covalent bonds are strong but they only exist between the atoms in the molecule

cannot dissolve in water

Cannot conduct electricity because there are no particles free to move